Marking device



K. R. STRAUSS MARKING DEVICE April 7, 1942.

Filed May 9, 1941 INVENTOR W BY ATTORNEY Patented Apr. 7, 1942 siresMARKING DEVICE Application May 9, 1941, "Serial No. 392,758 3 Claims.01. 33-21) This invention relates to marking devices used for thepreparation of test samples fordetermining the characteristics of marksplaced upon paper sheets or cards by so-called pencil leads or othermarking agents of similar character.

In particular, this invention relates "to an automatic device foraccurately placing'test markings upon some suitable sheet materialforpurposes of comparative testin'g where the marking pressure, markingspeed, and mark dimensions are under electromechanical control.

In the recording art so-called conductive marks placed upon work sheetsby graphite pencils are electrically sensed to obtain the informationthereby indicated. It is, therefore, important in any process or machinewhere such marks are employed to record information that thecharacteristics of these markings be predetermined by suitable tests.Effective tests upon such marks in the form of microscopic inspections,electrical conductivity tests, photographic tests, and abrasive effecttests, can be made. However, unless test samples are uniformly preparedby a standardized and accurate marking method, no matter how effectivethe tests, the results mean nothing. i

It is, accordingly, an object of this invention to provide an improvedmarking device for the preparation of standard test samples of variouskinds of sheet materials upon which marks have been made by variouskinds of marking agents.

It is a further object of this invention to provide a marking device,for the preparation of marked test sheets, in which a test sheet clampedabout a drum is reciprocated past a weighted marking pencil tracing andretracing a mark upon the sheet for a predetermined number of times at adefinite rate, the complete operatic being automatically controlled.

Other objects of the invention will be pointed out in the followingdescription and claims and illustrated in the accompanying drawing,which discloses, by way of example, the principle of the invention andthe best mode, which has been contemplated, of applying that principle.

In the drawing:

Fig. 1 is a plan view of the marking device showing the arrangement ofthe various components.

Fig. 2 is a side elevation view of Fig. 1.

Fig. 3 is a circuit diagram of the electrical control features.

Referring to Figs. 1 and 2, a governor-controlled constant speed motorID is connected through the gear reduction unit ll.

The drum 5 index pin l9.

shaft [2 is turned between the reduction gear bearing and a bearingscrew I3. Mounted axially on shaft I2 is thedrum 18 which is positionedand held at a given place on shaft I2 by the A pencil receptacle l5,composed of a weight mounted on a slidable tube, has a clamping screw 16for holding the pencil l4; Coacting with this receptacle I5 is a stop I!which acts to hold receptacle IS in such a position that a pencilclamped in the receptacle will not contact the drum until stop H isreleased. The drum l8 has a sheet clamp 2| provided for holding thesample sheet to be marked in place on the lateral surface of the drum. Amanually operated main switch is provided by the double pole singlethrow toggle switch 28. A double pole double throw toggle switch 22 isprovided to be manually operated to index the drum (see explanationlater in text).

A double pole double throw toggle switch 21 is so placed that a fin 35on shaft I2 will engage and operate it when'the shaft I2 turns throughapproximately 270. This action takes place in either direction of theshafts rotation. Another double pole double throw toggle switch 26 isconnected to switch 21 by link 28 so that its operation coincides withthat of switch 21. Switch 26 is operated to reverse the rotation ofmotor In, and switch 2'! is operated to successively energize the relays23, 24 and 25 in cooperation with their operating contacts.

Referring to Fig. 3, the entire circuit is protected by fuses 33 and thepreviously mentioned main line switch 20. The motor ID has its armatureconnected through switch 26 in such a way that engagement of that switchin the A position will cause the armature to rotate in one directionwhile with switch 26 engaged at B the armature will rotate in thereverse direction, the current in the field 34 of motor It beingconstant. Contacts 29 are governor contacts, centrifugally controlled,which together with the aid of resistor 30 and condensers 3| and 32 tendto keep the motor speed constant.

A test sample is prepared as follows: sheet material, e. g. paper, isplaced about drum l8 and clamped in place by the clamp 2|. Switch 22 isset at B. Switch 20 is now closed and opened to rotate the drum tofacilitate paper adjustment, if necessary. The desired marking pencil I4is inserted into the receptacle clamped in place by the screw l6, andthe stop I1 is released allowing the active (marking) end of the pencilM to come into contact with the sheet on drum H3. The setup is checkedand the pencil and receptacle are then raised and held by stop l1.

The drum must now be set at the start of the drum cycle. Switch 22 isset at A. Switch 20 is now closed and the motor armature rotates untilswitch 21 is thrown by the fin 35 to the A position'when the relay 25 isenergized and the relay points 25A open, thereby breaking the mo torcircuit and stopping the drum I 8. Switch 20 is now opened, and thereceptacle I and pencil l4 moved down by releasing stop [1 causing thepencil to contact the sheet on drum l8.

The test sample is now run through a complete drum cycle. Switch 22 isset at B. Switch 20 is closed and the drum rotates in a given directionuntil switches 26 and 21 are operated by fin 35, being thrown to their Bpositions. The motor now reverses and relay 23 is energized closingpoints 23A and 23B, the latter points'holding relay 23 energized. Themotor continues to operate in the reverse direction until switches 25and 21 are again operated by fin 35 to their A positions. The motoragain reverses to its original direction of rotation, and relay 24 isenergized, through 23A points, closing points 24A and 24B. .Relay 24 isheld energized by the 243 points. 'The motor continues to r tate in theoriginal direction until switches 26 and 2"! are again operated by fin35 to their B positions. Relay 25 is now energized through the 24Apoints and the 25A points'open breaking the motor circuit. The cycle isnow complete. Switch 20 is opened and the test sample is removed fromthe drum or re-indexed for another run at a different location on thesheet.

It has been determined by experiment that a mark consisting of a tracein one direction, a retrace in the opposite direction, and a secondretrace in the original direction is most desirable for'the testsenumerated above. However, by changing the circuit connections or byadding relays, any desired combination of traces and retraces may besecured. A further requirement found by experiment is that drum [8shouldbe polished and made to rotate positively true upon the shaft l2.

Whilethere has been shown and described and pointed out the fundamentalnovel features of the invention as applied to various modifications, itwill be understood that various omissions and substitutions and changesin the form and details of the device illustrated and in its operationmay be made by those skilled in the art without departing from thespirit of the invention. It is the intention therefore to be limitedonly as indicated by the scope of the following claims:

What is claimed:

1. A mechanism for preparing a test sheet traced upon by a markingpencil comprising a rotatable drum, a clamp on said drum for holdingsaid sheet wrapped about said drum,'a shaft upon which said drumrotates, a pin fixing said drum to said shaft in one of severalpredetermined positions, a drivingmotor, reductiongearing connectingsaid motor to said shaft, a reversing switch, a selecting switch, aconnecting link joining the said switches for unitary operation, relays,circuit connections between said selecting switch and said relays forsuccessively operatingthe latter to stop the said motor within a giventime, circuit connections between the said reversing switch and the saidmotor for reversing the'rotation of the latter upon operation of theformer, a fin upon the said shaft to engage and operate the saidswitches after said shaft has rotated less than one complete revolutionin either direction, and a weighted receptacle forholding the saidmarking pencil in contact with the lateral surface of the said drum tomark the said sheet as it is rotated past the said pencil.

2. A sheet marking device comprising a drum, a shaft upon which saiddrum is rotated, a clamp on said drum for holding said sheet wrappedabout said drum, a slidable receptacle mounted over said drum forholding a marking instrument; the said receptacle being provided with aweight, the said weight normally urging said receptacle to press thesaid marking instrument against the lateral surface of the said drum, astop for holding the said receptacle away from the said drum, a pin forfixing said drum to said shaft, means for rotating said shaft in eitherclockwise or counterclockwise direction comfor oscillating said cylinderabout its axis at constant speed, and means cooperative with the saidoscillating means for automatically stopping such oscillation after apredetermined number of cycles.

KARL'R. STAUSS.

Patent No. 2,279,075.

CERTIFICATE OF CORRECTION.

. p l 7, 9 m. KARL R. S'I'AUSS.

It is hereby certified that error appears in the above numbered patentrequiring correction as follows: In the heading to the drawing, name ofinventor, for "K. R. STRAUSS" read -K. R. STAUS S; and page 2, secondcolumn, line )49, claimfi, for "marked" read "markingand that the saidLetters Patent should be read with this correction therein that the samemay conform to the record of the case in the Patent Office.

Signed and sealed this 16th day of June, A. D. 1914.2.

Henry Van Ar sdale (Seal) Acting Commissioner of Patents.

